Polyurethane Sealant for Building

建筑用聚氨酯密封剂是一种主要由液态聚硫化物橡胶组成的弹性密封材料，设计用于对各种建筑接缝进行防水密封。它根据产品形式分为两种类型：单组分和两组分。
主要特点：
单组分产品通过与空气中的水分反应固化，提供便捷的使用。它拥有宽阔的可调节性能范围和强大的适应性。其主要特性包括良好的耐磨性、高机械强度、出色的附着力以及良好的弹性和优异的恢复性，使其适合动态关节。它还表现出良好的低温柔韧性、卓越的耐候性、良好的耐油性、抗生物老化能力以及适中的定价。
双组分产品通过混合两种组分的反应固化，固化速度可调节以适应不同的施工条件。该产品对混凝土、金属和木材等多种基材具有良好的附着力。固化后，它形成一种弹性体，能够适应关节的热膨胀、收缩和结构位移。它具有优异的耐磨性、低温柔性、广泛的可调性能范围、高机械强度、良好的附着力和优异的弹性，具有优异的恢复性能，适用于动态接头、变形接头和膨胀接头。其他特点包括良好的耐候性、卓越的耐油性、抗生物老化能力以及成本效益。

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Product Classification

By flow characteristics: Non-Sag (N) for vertical and inclined joints; Self-Leveling (L) for horizontal joints.
By modulus: High Modulus (HM) suitable for joints with smaller movement; Low Modulus (LM) suitable for joints with larger movement.

Product Parameters

No.	Item		Specification
			25LM	25HM	20LM	20HM
1	Density g/cm³		Nominal value±0.1
2	Tack-free Time h		≤24
3	Working Life (Pot Life） h		≥0.5
4	Flow Characteristics	Sag (Type N) mm	≤3
5	Extrudability ml/min		≥150
6	Tensile Adhesion at Maintained Extension		No failure
7	Elastic Recovery %		≥70
8	Tensile Modulus MPa	23℃	≤0.4	＞0.4	≤0.4	＞0.4
		-20℃	≤0.6	＞0.6	≤0.6	＞0.6
9	Bonding Properties after:Cold Stretch & Heat Compression/Immersion & Extension/Artificial Weathering		No failure
10	Mass Loss %		≤5

Note: This data represents partial parameters for the polyurethane sealant. Please contact us for complete data sheets for all products.

Application Scope

This product is used in civil engineering and construction, transportation, and for sealing connections and construction joints of precast concrete components. Applications include sealing and filling of joints in roads, bridges, airport runways, underground pipelines, pipe connections, as well as expansion joints and deformation joints in tunnels and buildings.

Application and Storage

Application Method

Surface Preparation: The application surface must be clean, dry, and free from oil, dust, and loose particles. Primer may be used if necessary.

Mixing (Two-Component): Mix Component A and B thoroughly according to the specified ratio on the package, avoiding air entrapment.

Application

Non-Sag Type: Apply into the joint using a caulking gun or spatula, then compact and smooth.

Self-Leveling Type: Pour into horizontal joints; it will level naturally.

Curing: Protect the applied sealant from water or contamination until fully cured. Curing time is influenced by temperature and humidity.

Cleanup: Uncured material can be removed from tools using specialized solvents. Cured material requires mechanical removal.

Packaging and Storage

Packaging Specifications: Various packaging forms are available based on user requirements.
Storage Conditions: Store in a cool, dry place away from direct sunlight.